File: feature-gate-marker_trait_attr.rs

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rustc 1.89.0%2Bdfsg1-1
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use std::fmt::{Debug, Display};

#[marker] trait ExplicitMarker {}
//~^ ERROR the `#[marker]` attribute is an experimental feature

impl<T: Display> ExplicitMarker for T {}
impl<T: Debug> ExplicitMarker for T {}

fn main() {}